Core-making machine.



PATBNTED MAY 5, 1903. H. E. PRIDMORE.

GORE MAKING MACHINE. APPLICATION FILED NOV. 27. H500. RENEWED SEPT. 30. 1902.

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WITNESSES PATENTED MAY 5,1903.

H. E. PRIDMOREF CORE MAKING MACHINE.

APPLIOATION IILEDNOV. 27. 1900. RENEWED SEPT, 30. 19o2.-

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PATENTED MAY 5, 1903.

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ATENT FFICE.

HENRY E. PRIDMORE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE NATIONAL MALLEABLE CASTINGS COMPANY, OF CLEVELAND, OHIO, A CORPORA- TION OF OHIO.

CORE-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 727,556, dated May 5, 1903.

Application filed November 27, 1900. Renewed September 30, 1902. Serial No, 125,441. (No model.)

To ttZZ whom it new concern.-

Be it known that I, HENRY E. PRIDMORE, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Core-Molding Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is an end view showing the corebox closed. Figs. 2 and 3 are detail views. Fig. l is a longitudinal section on line IV IV of Fig. 1. Fig; 5 is a partial plan view of the machine with the arbor omitted. Fig. 6'

is a cross-section on the line VI VI of Fig.

4. Figs. 7 and 8 are details of the slides.

My invention is designed to afford means for making sand cores for hollow castings, such as car-axle boxes and other castings, more expeditiously and with need ofless skilled labor than has been required heretofore.

In the drawings, 2 2 represent the movable sides of a core-box, and 2 is a stationary bottom forming part of the frame A of the machine. The sides of the core-box are supported, respectively, on levers 3 3, which are fulcrumed at their lower ends on a shaft or axis 4, thus affordingalong radius of motion and enabling the sides of the core-box to move nearly in a horizontal plane. To operate the levers, I use a crank-shaft 5, having cranks 6 6 connected to the lovers by links 7 7, so that on turning the shaft the sections of the core-box will be moved simultaneously toward or from each other by an even and uniform motion. 7 Means for imparting such simultaneous motion constitute an important feature of my invention, as it enables the to core-box sections to be separated from the core by unskilled labor without danger of breaking or marring the core, and this hitherto has been a difficult operation, requiring considerable skill. The cranks and links are set relatively to each other, so that when the sides of the box are closed, as shown in Fig. 1, each link shall extend from its lever beyond the crank-shaft to the far side thereof and shall extend to or nearly to the central line a a, which connects the crank-axis with the points where the links are joined to the levers. The consequence is that when the sides of the box are closed together they are locked-firmly and cannot. be separated except by turning thecrank-shaft reversely. I prefer to extendthe crank-shaft from end to end of the machine and to employ a set of lovers, cranks, and links at each end. To permit independent lateral adjustment of the sides of the core-box, I prefer to use eccentric bushings 7 by which the links are secured to the levers, and on turning the bushingon either lever the lever may be adjusted, being drawn inwardly or retracted, as may be necessary, in order to cause the side of thecore-boX to which it is attached to meet and fit neatly against the other side.

The core-box itself is of the contour required for the casting and is provided with vertical slides 8 8, adapted to receive the usual dry-sand core 9, which forms the dustchamber'of the journal-box and which is placed between the slides previously to introducing the green sand into the core-box. These projections 10 are designed to make recesses in the core at the places where the projections occur.

The stationary bottom 2 is curved on its surface at the endportions, as shown in Fi 6, the curvature being substantially concentric with the axis 4, so that the sides of the car-box may be drawn apart freely and without interference with the bottom.

The arbor on which the core 0 is molded comprises a bar 11 and end plates 12 12, the inner faces of which are formed with steps or ratchet-like projections 13, adapted to make firm engagement between the plates and the core, and at the bases of the plates are flanges l4, constituting core-prints on which the finished core may be supported and centered in the mold. I

In making a core with my improved apparatus the arbor is placed in position and the sides of the core box closed together, the slides 8 8 and the dry-sand core 9 having first been adjusted in position. Green sand is then heaped into the core-box upon, the arbor and is rammed tightly with suitable ra1nming-tools until it is flush with the top of the core-box, whereupon the sand is struck or smoothed off at the top, the sides of the corebox Withdrawn by operation of the crankshaft, the slides 8 8 removed, and the core 0 lifted by seizing the ends of the arbor. This separation of the sides of the core-box is effected readily and without danger of breaking-or marring the core, and by reason of the teeth or steps on the end plates of the arbor the core will adhere firmly thereto, enabling the core to be lifted and manipulated with security.

I claim- 1. In a core-molding machine, the combination of a frame, levers fulcrnmed in said frame at their lower ends, means whereby said levers are moved, and a core-box having laterally-movable sides carried by said levers; substantially as described.

2. In a core-molding machine, the combination of a frame having a table, levers fulcrumed in said frame at their lower ends, means whereby said levers are moved, and a core-box having laterally-movable sides car-- ried by said levers, substantially as described.

In a core-molding, machine, the combination of a core-box having movable sides, a bent crank opcratively connected to each side, a crankshaft, and links connecting said shaft and cranks, the cranks and links being so set that the sides of the core-box are locked when closed together; substantially as described.

4. In a core-molding machine, the combination with the laterally-movable sides of a core-box, of levers to which they are attached, said levers being fulcrumed at their lower ends, and means whereby said levers are moved, said levers being fulcru med on a common axis, and having operating-cranks above said axis; substantially as described.

In testimony whereof I have hereunto set my hand.

HENRY E. PRIDMORE.

Witnesses:

R. B. SWIFT, W. P. BURKE. 

